Google announced changes to its ad policies earlier this week that could have a big impact on its revenue: the search and advertising company has declared that it will no longer allow ads for sexually explicit websites through its AdWords platform, according to CNBC.

Any ads found to be in violation of the updated policy will be removed from the network, Google told advertisers that could potentially be affected in an email. This change only impacts the company’s ad offering, not search results or any other products, so while some sites may see an impact, it won’t be as big a hit as if listings were removed from search.

That being said, some in the adult entertainment industry told CNBC that they fear this could simply be the first step in a larger campaign to change how Google as a whole handles such content. Some even worry that their search listings could eventually end up on the chopping block as well, though Google hasn’t given any indication that that’s the case.